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Ultralight X-type lattice sandwich structure (Ⅱ):Micromechanics modeling and finite element analysis

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Science china(Technological Sciences) 2009年第9期52卷 2670-2680页

作者： zhang qiancheng1,CHEN AiPing 2,CHEN ChangQing2,3 & lu tianjian2 1 State key laboratory for Mechanical Behavior of Materials,school of Material Science and Engineering,xi’an jiaotong university,xi’an 710049,china 2 moe key laboratory for strength and vibration,school of aerospace,xi’an jiaotong university,xi’an 710049,china 3 Department of Engineering Mechanics,AML,Tsinghua university,Beijing 100084,china State key laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi’an Jiaotong University Xi’an China moe key laboratory for strength and vibration School of Aerospace Xi’an Jiaotong University Xi’an China Department of Engineering Mechanics AML Tsinghua University Beijing China

The methods of homogenization and finite elements are employed to predict the effective elastic constants and stress-strain responses of a new type of lattice structure,the X-structure proposed by the authors in a companion paper. It is shown that in most cases the predictions by the equivalent homogenization theory agree well with the experimental and 3-dimensional finite element calculated results. The theoretical and numerical study supports the argument that the X-structure is superior to the pyramid lattice structure in terms of mechanical strength.

关键词： sandwich panel lattice structure equivalent homogenization finite element model

EXPERIMENTAL AND SIMULATED COMPRESSIVE PROPERTIES OF WORK-HARDENED X-TYPE LATTICE TRUSS STRUCTURES

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Acta Mechanica Solida Sinica 2012年第2期25卷 111-116页

作者： qiancheng zhang tianjian lu moe key laboratory of strength&vibration School of AerospaceXi'an Jiaotong UniuersityXi'an 710049China

The expanded metal sheets were folded with 11% work-hardening. These were sub- sequently used with resistance welding to construct X-type lattice truss sandwich panels having a core relative density of 0.17. The sandwich panels were tested in uniaxial compression and, for comparison, the method of finite elements was employed to simulate the measured compressive stress-strain curves. The peak compressive strength was 32% higher than that of pyramidal core sandwiches. The enhanced mechanical properties of the work-hardened X-Type lattice structures mainly originate from the contribution of straight struts with low degree of curvature and work hardening, rather than the two-dimensional staggered nodes.

关键词： sandwichs work hardening resistance welding X-type core

Ultralight X-type lattice sandwich structure(I):Concept,fabrication and experimental characterization

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Science china(Technological Sciences) 2009年第8期52卷 2147-2154页

作者： zhang qiancheng HAN YunJie CHEN ChangQing lu tianjian State key laboratory for Mechanical Behavior of Materials School of Material Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China moe key laboratory for strength and vibration School of AerospaceXi’an Jiaotong UniversityXi’an 710049China Department of Engineering Mechanics AMLTsinghua UniversityBeijing 100084China

A new type of ultra-lightweight metallic lattice structure (named as the X-type structure) is reported. This periodic structure was formed by two groups of staggered struts in the traditional pyramid structure, and fabricated by folding expanded metal sheet along rows of offset nodes and then brazing the folded structure (as the core) with top and bottom facesheets to form sandwich panels. The out-of-plane compressive and shear properties of the X-type lattice sandwich structure were investigated experimentally and compared to those of the sandwich having a pyramidal truss core. It is found that the formation of the 2-dimensional staggered nodes can effectively make the X-type structure more resistant to inelastic and plastic buckling under both compression and shear loading than the pyramidal lattice truss. Obtained results show that the compressive and shear peak strengths of the X-type lattice structure are about 30% higher than those of the pyramidal lattice truss having the same relative density.

关键词： sandwich panel lattice structure X-type structure brazing plastic yielding

Development of multifunctional lightweight cellular metals through interdisciplinary efforts

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Chinese Science Bulletin 2009年第20期54卷 3844-3846页

作者： lu Tian Jian zhang qiancheng moe key laboratory for strength and vibration School of Aerospace Xi'an Jiaotong University Xi'an 710049 China State key laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

In spite of her phenomenal economic achievement since the historically imperative implementation of the 'open door' policy in

关键词：金属蜂窝多学科多功能轻质保护环境能源资源金融危机工业化

Performance enhancement of sandwich panels with honeycomb–corrugation hybrid core

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Theoretical & Applied Mechanics Letters 2016年第1期6卷 54-59页

作者： Bin Han Wenbin Wang Zhijia zhang qiancheng zhang Feng Jin tianjian lu school of Mechanical Engineering Xi'anJiaotong UniversityXi'an 710049China moe key laboratory for Multifunctional Materials and Structures Xi'an Jiaotong UniversityXi'an 710049China State key laboratory for Mechanical Structure strength and vibration Xi'an Jiaotong UniversityXi'an 710049China

The concept of combining metallic honeycomb with folded thin metallic sheets （corrugation） to construct a novel core type for lightweight sandwich structures is proposed. The honeycomb-corrugation hybrid core is manufactured by filling the interstices of aluminum corrugations with precision-cut trapezoidal aluminum honeycomb blocks, bonded together using epoxy glue. The performance of such hybrid-cored sandwich panels subjected to out-of-plane compression, transverse shear, and three-point bending is investigated, both experimentally and numerically. The strength and energy absorption of the sandwich are dramatically enhanced, compared to those of a sandwich with either empty corrugation or honeycomb core. The enhancement is induced by the beneficial interaction effects of honeycomb blocks and folded panels on improved buckling resistance as well as altered crushing modes at large plastic deformation. The present approach provides an effective method to further improve the mechanical properties of conventional honeycomb-cored sandwich constructions with low relative densities.

关键词： Honeycomb-corrugation Compression Shear Bending Performance enhancement

Analytical design of effective thermal conductivity for fluid-saturated prismatic cellular metal honeycombs

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Theoretical & Applied Mechanics Letters 2016年第2期6卷 69-75页

作者： Wenbin Wang xiaohu Yang Bin Han qiancheng zhang xiangfei Wang tianjian lu moe key laboratory for Multifunctional Materials and Structures Xi'an Jiaotong UniversityXi'an 710049China Department of Building Environment and Energy Engineering Xi'an Jiaotong University.Xi'an 710049China school of Mechanical Engineering Xi'an fiaotong UniversityXi'an 710049.China State key laboratory for strength and vibration of Mechanical Structures Xi'an jiaotong UniversityXi'an 710049China

A comparative optimal design of fluid-saturated prismatic cellular metal honeycombs （PCMHs） having different cell shapes is presented for thermal management applications. Based on the periodic topology of each PCMH, a unit cell （UC） for thermal transport analysis was selected to calculate its effective thermal conductivity. Without introducing any empirical coefficient, we modified and extended the analytical model of parallel-series thermal-electric network to a wider porosity range （0.7 ~ 0.98） by considering the effects of two-dimensional local heat conduction in solid ligaments inside each UC. Good agreement was achieved between analytical predictions and numerical simulations based on the method of finite volume. The concept of ligament heat conduction efficiency （LTCE） was proposed to physically explain the mechanisms underlying the effects of ligament configuration on effective thermal conductivity （ETC）. Based upon the proposed theory, a construct strategy was developed for designing the ETC by altering the equivalent interaction angle with the direction of heat flow： relatively small average interaction angle for thermal conduction and relatively large one for thermal insulation.

关键词： Effective thermal conductivityPrismatic cellular metal honeycombLigament heat conduction efficiencyAnalytical designEquivalent interaction angle